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Expresso takes a simple musical expression (literally "X") and mutates it.
In each generation, transformations are applied to
components of the expression. This is a fractal technique known as an
L-system.
The more generations there are, the larger and
more complex the expression gets (and the longer it can take
to compute).
The output varies wildly, from boring to fascinating.
Press "Mutate" a few times
till you get something that looks interesting, then click
on the image to play it. See Composer's Quarry for examples of output.
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After 15 generations the expression "X" became this: | (shuffle(step((transpose(transpose((((arpeggio(X) +transpose(((transpose(X,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) +transpose(((X+transpose(X,7) ) +transpose(step(X,12) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) ,-5) +(shuffle(step((((shuffle(X) |arpeggio((X+transpose(X,12) ) ) ) +transpose(transpose(X,-5) ,4) ) +transpose(((echo(transpose(X,-7) ,4,6) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(shuffle(shuffle(shuffle(X) ) ) ,7) ) ,7) ) ,12) ) +(transpose(arpeggio(((shuffle((X|X) ) +transpose((X+transpose((X+echo(X,4,6) ) ,12) ) ,4) ) +transpose(transpose(echo((X+X) ,4,6) ,-5) ,7) ) ) ,-7) |shuffle(transpose((transpose(shuffle(echo(X,4,6) ) ,-7) +transpose(shuffle(step(X,12) ) ,12) ) ,-5) ) ) ) ) ,12) ) +transpose(transpose(transpose((transpose(step(echo(step(arpeggio(transpose(X,-7) ) ,12) ,4,6) ,12) ,-5) +transpose(shuffle((transpose((((((echo(X,4,6) +transpose(step(shuffle(X) ,12) ,4) ) +transpose(step(X,12) ,7) ) +transpose(arpeggio((X+X) ) ,4) ) +transpose(((X+X) |step(X,12) ) ,7) ) +(transpose(step((step(X,12) +X) ,12) ,-5) +transpose(echo((transpose(X,-7) +X) ,4,6) ,12) ) ) ,-5) |echo((transpose(X,-7) +transpose(((X+transpose(X,7) ) +transpose(shuffle(arpeggio(X) ) ,12) ) ,12) ) ,4,6) ) ) ,7) ) ,-7) ,-7) ,12) ) random seed used was 18
EXPR = shuffle(transpose(((transpose(transpose(echo(((X+transpose(X,-5) ) +transpose(transpose(X,-7) ,12) ) ,4,6) ,-7) ,4) +transpose(shuffle(transpose(((transpose(transpose(step(arpeggio(X) ,12) ,-7) ,4) +transpose(transpose(echo(transpose(X,4) ,4,6) ,-7) ,4) ) +transpose(shuffle((X+transpose(transpose(arpeggio(X) ,-5) ,12) ) ) ,7) ) ,-5) ) ,4) ) +transpose(arpeggio((((shuffle(transpose((X+transpose((((X+transpose(transpose(transpose(X,-5) ,-7) ,12) ) +transpose(transpose(step((X+transpose(X,12) ) ,12) ,-7) ,4) ) +transpose(((step(transpose(X,-7) ,12) +transpose(transpose(step(X,12) ,4) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,12) ) ,-5) ) +transpose(transpose((echo(((X+transpose(X,12) ) |transpose(X,4) ) ,4,6) |transpose(transpose(transpose(X,-7) ,-7) ,4) ) ,4) ,7) ) +transpose(transpose(transpose((transpose(shuffle((((transpose(X,-7) +transpose(transpose(X,-5) ,12) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) +transpose(echo((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) ,12) ) ) ,-7) +transpose(((arpeggio((((X+transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(transpose(transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,-7) ,-7) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,12) ) ,-7) ,-5) ,4) ) +transpose(((((arpeggio(((((X+transpose(X,7) ) +transpose(echo(((arpeggio(X) +transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ,7) ) +transpose(transpose(((transpose(X,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose(shuffle(X) ,7) ) ,-5) ,4) ) +transpose(transpose(shuffle((X|X) ) ,-5) ,7) ) ) +transpose((arpeggio(transpose(transpose(X,-7) ,-7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(transpose(arpeggio(transpose(transpose(X,4) ,-7) ) ,-5) ,7) ) +transpose(transpose((echo((X+X) ,4,6) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,4) ) +transpose(((transpose((arpeggio(X) +transpose(X,-7) ) ,-7) |shuffle(transpose(transpose(transpose(X,-7) ,-5) ,-7) ) ) |(echo((X+transpose(X,7) ) ,4,6) +transpose(transpose(X,-7) ,-7) ) ) ,7) ) ,7) ) ) ,7) ) ,-7) ) random seed used was 0
EXPR = shuffle((transpose(transpose(transpose(arpeggio(transpose(transpose(arpeggio(X) ,-7) ,-5) ) ,-5) ,-5) ,-7) |(((echo(step(transpose(transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,-5) ,-5) ,12) ,4,6) +transpose(((transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) +transpose(arpeggio(step(transpose(arpeggio(transpose(X,-7) ) ,-7) ,12) ) ,4) ) +transpose(arpeggio(((transpose(X,-7) +transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose((transpose((X+X) ,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) ) ,7) ) ,4) ) +transpose(step(transpose(shuffle(X) ,-5) ,12) ,7) ) |((transpose(step((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +(transpose(X,-7) |X) ) ,12) ,-5) +transpose(transpose(transpose(echo(transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ,4,6) ,-5) ,4) ,4) ) +transpose(transpose(transpose((step(shuffle(echo((X+transpose(X,12) ) ,4,6) ) ,12) +transpose(shuffle(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) ,4) ) ,7) ) ,-5) ,-5) ,7) ) ) ) ) random seed used was 0
EXPR = ((arpeggio(transpose(arpeggio((((step((X+transpose(X,12) ) ,12) +transpose(transpose((X+transpose(X,7) ) ,-5) ,12) ) +transpose(((transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) +transpose(echo(X,4,6) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) +transpose((shuffle(transpose(echo((X|X) ,4,6) ,-7) ) +transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) |arpeggio(transpose(X,-7) ) ) ,-5) ,12) ) ,12) ) ) ,-7) ) +transpose(((((echo(step(step(X,12) ,12) ,4,6) +transpose((((X+transpose(shuffle(X) ,7) ) +transpose(((X+transpose(transpose(X,-7) ,7) ) +step(X,12) ) ,7) ) +transpose(echo(arpeggio(transpose(X,4) ) ,4,6) ,12) ) ,12) ) +transpose(transpose((echo(((arpeggio(shuffle(transpose(X,-7) ) ) +transpose((echo(echo(transpose(transpose(X,-5) ,-5) ,4,6) ,4,6) +transpose(shuffle(transpose(X,-5) ) ,12) ) ,4) ) +transpose((transpose((X+X) ,-7) +step((X+X) ,12) ) ,7) ) ,4,6) +transpose(((transpose(X,-5) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) |echo(step((echo(X,4,6) +(X+transpose(X,12) ) ) ,12) ,4,6) ) ,12) ) ,4) ,4) ) +transpose(transpose(arpeggio((arpeggio(transpose(X,-7) ) |shuffle(transpose(transpose(((((X|X) +transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) ,-5) ) ) ) ,-7) ,7) ) +transpose(arpeggio((((((transpose(step(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,-5) +transpose(transpose((shuffle(X) +transpose(transpose(X,-7) ,7) ) ,-7) ,4) ) +transpose(echo(echo(transpose(X,-5) ,4,6) ,4,6) ,7) ) +transpose(arpeggio(((transpose((transpose(X,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) +transpose(shuffle(transpose(arpeggio(X) ,-7) ) ,4) ) +transpose(((shuffle(arpeggio(X) ) +transpose(((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) ,7) ) ) ,4) ) +transpose(transpose(transpose((((transpose(echo(X,4,6) ,-5) +transpose(X,4) ) +transpose((X+transpose(arpeggio(X) ,7) ) ,7) ) |transpose(transpose(X,4) ,-5) ) ,-5) ,-7) ,7) ) +transpose(((arpeggio(transpose(X,-5) ) +transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) |(((X|X) +echo(X,4,6) ) |(shuffle(X) +transpose(transpose(X,-7) ,12) ) ) ) ,-7) ) ) ,7) ) ,12) ) +transpose(transpose(transpose((echo(transpose(transpose(transpose(echo(arpeggio(X) ,4,6) ,-5) ,-5) ,-7) ,4,6) +transpose((step((((X+transpose(arpeggio(X) ,12) ) |transpose(X,4) ) +arpeggio(transpose((X|transpose(X,-5) ) ,-7) ) ) ,12) +transpose(((((echo((X+transpose(X,12) ) ,4,6) +transpose(shuffle(X) ,4) ) +transpose(step((X+X) ,12) ,7) ) +transpose(shuffle(transpose(transpose(transpose(X,-5) ,-7) ,-5) ) ,12) ) +transpose(step(step((step(shuffle(X) ,12) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ,12) ,12) ,7) ) ,7) ) ,12) ) ,-7) ,-5) ,12) ) random seed used was 0
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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